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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd150350145ae02467ce99527e6e157d14bfa8c9c11bc1362892c0cd3f0b78462' 
  AND token = '7voRi9VVvJkwtBaFWRtP4E1R0pRBnF2e2MXn5rIhBgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}